5x.(53)2=625
=> 5x.56=54
=> 5x=54:56
=> 5x=5-2
=> x=-2
Vậy x=-2
\(^{=>5^x.5^6=5^4}\)
=> \(5^x=5^{4-6}\)
=>x=-2
5x.(53)2 = 625
<=> 5x.56 = 54
5x = 54 : 56 ( 54-6 )
5x = 5-2
<=> x = -2
5x.(53)2 = 625
<=> 5x.56 = 54
5x = 54 : 56 ( 54-6 )
5x = 5-2
<=> x = -2
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